Add memcpy_to_p24_from_i32

Change-Id: I695601d9cf9ffddd349e33779c761e60faf8d072
diff --git a/audio_utils/primitives.c b/audio_utils/primitives.c
index df1dc0b..254f3af 100644
--- a/audio_utils/primitives.c
+++ b/audio_utils/primitives.c
@@ -171,6 +171,23 @@
     }
 }
 
+void memcpy_to_p24_from_i32(uint8_t *dst, const int32_t *src, size_t count)
+{
+    while (count--) {
+        int32_t ival = *src++ >> 8;
+
+#ifdef HAVE_BIG_ENDIAN
+        *dst++ = ival >> 16;
+        *dst++ = ival >> 8;
+        *dst++ = ival;
+#else
+        *dst++ = ival;
+        *dst++ = ival >> 8;
+        *dst++ = ival >> 16;
+#endif
+    }
+}
+
 void memcpy_to_q8_23_from_i16(int32_t *dst, const int16_t *src, size_t count)
 {
     while (count--) {